Method for printing onto coloured substrates

Abstract

A method for printing an electronic image comprising a plurality of pixels onto a substrate using a computer-assisted image processing system, said method comprising the step of using alpha channel information in combination with substrate color information to calculate the transparency level that needs to be applied to each pixel.

1 . A method of printing an electronic image comprising a plurality of pixels onto a substrate using a computer-assisted image processing system, said method comprising the step of using alpha channel information in combination with substrate color information to calculate a transparency level that needs to be applied to each pixel, wherein the transparency level ranges from 0 percent to 100 percent. 
   
   
       2 . The method of  claim 1 , wherein the transparency level of a first pixel is set to 100 percent, and the color of the substrate is used as the color of said first pixel. 
   
   
       3 . The method of  claim 1 , wherein a transparency level of a second pixel is set to 0 percent, and a color of a pixel in said electronic image corresponding to said second pixel is used as the color of said second pixel. 
   
   
       4 . The method of  claim 1 , wherein a transparency level of a third pixel is set to a percentage between 1 percent and 99 percent, and the color of the substrate, in combination with a color of a pixel in said electronic image corresponding to said third pixel, is used as the color of said third pixel. 
   
   
       5 . The method of  claim 1 , wherein the substrate is non-white. 
   
   
       6 . The method of  claim 5 , wherein the substrate is black in color. 
   
   
       7 . The method of  claim 5 , wherein the substrate is translucent. 
   
   
       8 . The method of  claim 5 , wherein the substrate is transparent. 
   
   
       9 . The method of  claim 1 , wherein the substrate is white in color. 
   
   
       10 . The method of  claim 19 , further comprising the step of using alpha channel information in combination with substrate color information to produce said underbase. 
   
   
       11 . A computer system comprising a computer and a computer-assisted image processing system, said computer system used for printing an electronic image comprising a plurality of pixels using the method of  claim 1 . 
   
   
       12 . A computer system comprising a computer and a computer-assisted image processing system, said computer system used for printing an electronic image comprising a plurality of pixels using the method of  claim 10 . 
   
   
       13 . The method of  claim 2 , wherein the transparency level of a second pixel is set to 0 percent, and the color of a pixel in said electronic image corresponding to said second pixel is used as the color of said second pixel. 
   
   
       14 . The method of  claim 2 , wherein the transparency level of a third pixel is set to a percentage between 1 percent and 99 percent, and the color of the substrate, in combination with the color of a pixel in said electronic image corresponding to said third pixel, is used as the color of said third pixel. 
   
   
       15 . The method of  claim 14 , wherein the transparency level of a third pixel is set to a percentage between 1 percent and 99 percent, and the color of the substrate, in combination with the color of a pixel in said electronic image corresponding to said third pixel, is used as the color of said third pixel. 
   
   
       16 . A method for providing an underbase for use in creating an electronic image comprising a plurality of pixels using a computer-assisted image processing system, said method comprising the step of using alpha channel information to produce said underbase. 
   
   
       17 . The method of  claim 16 , wherein, in the step of using alpha channel information to produce said underbase, the alpha channel information is in an input color space. 
   
   
       18 . The method of  claim 16 , wherein, in the step of using alpha channel information to produce said underbase, the alpha channel information is in an RGB color space. 
   
   
       19 . A method of printing an image on a substrate, comprising:
 printing an underbase on the substrate which is a different color than the substrate, wherein:   the color of the substrate will form a portion of the image to be printed, and   the underbase will be printed over and make no part of the image to be printed.